enigmatical canon vs enigma canon

enigmatical canon and enigma canon both are nouns.

Word	Noun	Adjective	Verb	Adverb
enigmatical canon	Yes	No	No	No
enigma canon	Yes	No	No	No

As nouns, enigmatical canon and enigma canon are synonyms defined as:

enigmatical canon and enigma canon: a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)

Other synonyms of enigmatical canon include enigmatic canon, riddle canon.

enigmatical canon (noun)	enigma canon (noun)
a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)	a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)